Composed time signature

[gilles]

Hello.

Is it possible to have a composed time signature?
In
  file:///usr/share/doc/lilypond/html/input/test/out-www/collated-files.html
it is said that it can be faked but in the example, 6/4+[3/2], the 2 parts of
the bar have the same length, which can be faked as 2 bars.
But what about asymmetric signatures, e.g. 3/8+[2/4] ?

[I'm (still) using version 2.1.0 because there are no more recent official 
Debian 
upgrades.]

Best regards,
Gilles